docs: def exportCustomers(self, outPath):
          """exports customer list to a csv file
          Input:
           outPath - save location of the customer list
          """
          url = "%s/customers/export" % self.root
          params = {"f":"csv"}
          dirPath = None
          fileName = None
          if outPath is not None:
              dirPath = os.path.dirname(outPath)
              fileName = os.path.basename(outPath)
          return self._get(url=url,
                           param_dict=params,
                           securityHandler=self._securityHandler, proxy_url=self._proxy_url,
                          proxy_port=self._proxy_port,
                          out_folder=dirPath,
                          file_name=fileName)